RFC[PATCH 6/6] ARM: S5P64X0: Add clkdev bus lookup support
Rajeshwari Shinde
rajeshwari.s at samsung.com
Mon Aug 8 04:47:56 EDT 2011
Bus clock alias names created and added to clkdev which will be used
by HSMMC driver.
Signed-off-by: Rajeshwari Shinde <rajeshwari.s at samsung.com>
---
.../include/mach/s5p64x0-common-sdhci.h | 2 +
arch/arm/mach-s5p64x0/mach-smdk6440.c | 5 ++
arch/arm/mach-s5p64x0/mach-smdk6450.c | 5 ++
arch/arm/mach-s5p64x0/s5p64x0-common-sdhci.c | 7 +++
arch/arm/plat-samsung/Makefile | 1 +
arch/arm/plat-samsung/clkdev-busalias.c | 44 ++++++++++++++++++++
arch/arm/plat-samsung/include/plat/sdhci.h | 8 ++++
7 files changed, 72 insertions(+), 0 deletions(-)
create mode 100644 arch/arm/plat-samsung/clkdev-busalias.c
diff --git a/arch/arm/mach-s5p64x0/include/mach/s5p64x0-common-sdhci.h b/arch/arm/mach-s5p64x0/include/mach/s5p64x0-common-sdhci.h
index a3381f0..b81e6dd 100644
--- a/arch/arm/mach-s5p64x0/include/mach/s5p64x0-common-sdhci.h
+++ b/arch/arm/mach-s5p64x0/include/mach/s5p64x0-common-sdhci.h
@@ -10,6 +10,8 @@
#include <plat/sdhci.h>
+extern char *hsmmc_busclksrcs[4];
+
extern struct s3c_sdhci_platdata smdk64x0_hsmmc0_pdata;
extern struct s3c_sdhci_platdata smdk64x0_hsmmc1_pdata;
extern struct s3c_sdhci_platdata smdk64x0_hsmmc2_pdata;
diff --git a/arch/arm/mach-s5p64x0/mach-smdk6440.c b/arch/arm/mach-s5p64x0/mach-smdk6440.c
index 065977f..ad1b49d 100644
--- a/arch/arm/mach-s5p64x0/mach-smdk6440.c
+++ b/arch/arm/mach-s5p64x0/mach-smdk6440.c
@@ -177,6 +177,11 @@ static void __init smdk6440_machine_init(void)
s3c_sdhci2_set_platdata(&smdk64x0_hsmmc2_pdata);
platform_add_devices(smdk6440_devices, ARRAY_SIZE(smdk6440_devices));
+
+ /* create alias for clocks required by SDHCI */
+ s3c_sdhci_add_busclk_alias(&s3c_device_hsmmc0, hsmmc_busclksrcs);
+ s3c_sdhci_add_busclk_alias(&s3c_device_hsmmc1, hsmmc_busclksrcs);
+ s3c_sdhci_add_busclk_alias(&s3c_device_hsmmc2, hsmmc_busclksrcs);
}
MACHINE_START(SMDK6440, "SMDK6440")
diff --git a/arch/arm/mach-s5p64x0/mach-smdk6450.c b/arch/arm/mach-s5p64x0/mach-smdk6450.c
index 9e6fcef..f3f656e 100644
--- a/arch/arm/mach-s5p64x0/mach-smdk6450.c
+++ b/arch/arm/mach-s5p64x0/mach-smdk6450.c
@@ -196,6 +196,11 @@ static void __init smdk6450_machine_init(void)
s3c_sdhci2_set_platdata(&smdk64x0_hsmmc2_pdata);
platform_add_devices(smdk6450_devices, ARRAY_SIZE(smdk6450_devices));
+
+ /* create alias for clocks required by SDHCI */
+ s3c_sdhci_add_busclk_alias(&s3c_device_hsmmc0, hsmmc_busclksrcs);
+ s3c_sdhci_add_busclk_alias(&s3c_device_hsmmc1, hsmmc_busclksrcs);
+ s3c_sdhci_add_busclk_alias(&s3c_device_hsmmc2, hsmmc_busclksrcs);
}
MACHINE_START(SMDK6450, "SMDK6450")
diff --git a/arch/arm/mach-s5p64x0/s5p64x0-common-sdhci.c b/arch/arm/mach-s5p64x0/s5p64x0-common-sdhci.c
index 03d89f6..9721b2d 100644
--- a/arch/arm/mach-s5p64x0/s5p64x0-common-sdhci.c
+++ b/arch/arm/mach-s5p64x0/s5p64x0-common-sdhci.c
@@ -14,6 +14,13 @@
#include <mach/s5p64x0-common-sdhci.h>
+char *hsmmc_busclksrcs[4] = {
+ [0] = NULL,
+ [1] = NULL,
+ [2] = "sclk_mmc", /* mmc bus clock */
+ [3] = NULL,
+};
+
struct s3c_sdhci_platdata smdk64x0_hsmmc0_pdata __initdata = {
.cd_type = S3C_SDHCI_CD_NONE,
.clk_type = S3C_SDHCI_CLK_DIV_EXTERNAL,
diff --git a/arch/arm/plat-samsung/Makefile b/arch/arm/plat-samsung/Makefile
index 853764b..0aae4fa 100644
--- a/arch/arm/plat-samsung/Makefile
+++ b/arch/arm/plat-samsung/Makefile
@@ -31,6 +31,7 @@ obj-$(CONFIG_S3C_ADC) += adc.o
# devices
obj-y += platformdata.o
+obj-y += clkdev-busalias.o
obj-$(CONFIG_S3C_DEV_HSMMC) += dev-hsmmc.o
obj-$(CONFIG_S3C_DEV_HSMMC1) += dev-hsmmc1.o
diff --git a/arch/arm/plat-samsung/clkdev-busalias.c b/arch/arm/plat-samsung/clkdev-busalias.c
new file mode 100644
index 0000000..3e085a2
--- /dev/null
+++ b/arch/arm/plat-samsung/clkdev-busalias.c
@@ -0,0 +1,44 @@
+/* linux/arch/arm/plat-samsung/clkdev_busalias.c
+ *
+ * Copyright (c) 2011 Simtec Electronics
+ * http://www.samsung.com
+ *
+ * Helper function to add clkdev bus clocks alias names.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+*/
+
+#include <linux/clk.h>
+#include <linux/device.h>
+#include <linux/types.h>
+#include <linux/platform_device.h>
+
+#include <plat/sdhci.h>
+
+#define MAX_BUS_CLK (4)
+
+void s3c_sdhci_add_busclk_alias(struct platform_device *pdev,
+ char **mmc_busclks)
+{
+ int clk_cnt = 0, ptr;
+ char devname[14];
+
+ sprintf(devname, "s3c-sdhci.%d", pdev->id);
+
+ for (ptr = 0; ptr < MAX_BUS_CLK; ptr++) {
+ char *bus_name = mmc_busclks[ptr];
+
+ if (bus_name != NULL) {
+ char name[14];
+ sprintf(name, "mmc_busclk.%d", ptr);
+ clk_add_alias(name, devname, bus_name,
+ &pdev->dev);
+ clk_cnt++;
+ }
+ }
+
+ if (clk_cnt == 0)
+ dev_err(&pdev->dev, "No MMC bus clocks!");
+}
diff --git a/arch/arm/plat-samsung/include/plat/sdhci.h b/arch/arm/plat-samsung/include/plat/sdhci.h
index dde13aa..4933b6a 100644
--- a/arch/arm/plat-samsung/include/plat/sdhci.h
+++ b/arch/arm/plat-samsung/include/plat/sdhci.h
@@ -131,6 +131,14 @@ extern void s5p64x0_setup_sdhci1_cfg_gpio(struct platform_device *, int w);
extern void s5p6440_setup_sdhci2_cfg_gpio(struct platform_device *, int w);
extern void s5p6450_setup_sdhci2_cfg_gpio(struct platform_device *, int w);
+/*
+ * s3c_sdhci_set_busclk - Add alias to bus clocks supported, for clkdev support.
+ * @pdev: platform device to which the busclks are to be initialised.
+ * @mmc_busclks: Bus clocks suppored by SDHCI
+*/
+extern void s3c_sdhci_add_busclk_alias(struct platform_device *pdev,
+ char **mmc_busclks);
+
/* S3C2416 SDHCI setup */
#ifdef CONFIG_S3C2416_SETUP_SDHCI
--
1.7.4.4
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